If this vehicle has one serpentine belt chances are the belt must be replaced, look to see if there are visible cracks on the contact surface of the belt if so replace the belt if not then there may be a component in the pulley system that is starting to seize, the squeal is the pulley wheel offering more resistance at certain times therebye causing the noise, with the belt off try turning each pulley to see if binding is occuring, also check each pully wheel for loosness or play the bearing may be worn if play is detected.
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